Drop-hammer.



G. NIGKERSON. DROP HAMMER.

AiPLIGATION FILED APR.'7, 1919. v Patented Apr. 21, 1914.

. v 2 SHEETS-SHEET l. 5%- 3 INVENTOR ATTORNEY COLUMBIA PLANOGRAPH c0.. WASHINGTON. D. 6-.

APPLICATION FILED APR. 7, 1913.

c. NIGKERSON.

DROP HAMMER.

Patented 'Apr. 21, 1914.

2 SHEETSSHEBT 2.

- By 1 I I ORNEY v COLUMBIA PLANOURAPH co., WASHINGTON, D. c.

UNITED STATES PATENT OFFICE.

DROP-HAMMER.

To all whom it may concern:

Be it known that I, CLARENDON NIGKER SON, a citizen of the United States, residing at Waterbury, in the county of New Haven and State of Connecticut, have invented cer tain new and useful Improvements in Drop- Hammers, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to new and useful improvements in drop hammers, having for its object, among other things, to so design and construct the several parts that the adjusting screws may be readily inserted or removed, without disturbing the position of the hammer mechanism or uprights.

To these, and other ends, my invention consists in the drop hammer, having certain details of construction and combinations of parts, as will be hereinafter described, and more particularly pointed out in the claims.

Referring to the drawings, in which like numerals of reference designate like parts in the several figures, Figure 1 is a fragmentary side elevation of a portion of a drop hammer with my improvements c011- nected therewith; Fig. 2 is a side elevation thereof; Fig. 3 is an enlarged fragmentary side elevation of the bed; Fig. 4 is a side elevation of the lifter mechanism; Fig. 5 is a plan view thereof, partly in section; and Figs. 6 and 7 are a plan View and side elevation respectively of the keeper key.

The drop hammer to which my attachments are applied is of the usual type, and therefore have only shown in the drawings so much thereof as is necessary to understand my invention.

Referring to the drawings, the numeral 1 designates the base, 2 and 3 the uprights or side frames, 4 the hammer or ram that moves between the rails, 5 the hammer board, and 6 the lifter rod. All of these parts are con structed and operate in a well known manner. Heretofore it has been the practice to support the adjusting screws 7 the inner ends of which impinge against a face 9 upon the upright, in an opening in a lug upon the base, of substantially the same dlameter as the screw, with a nut 8 upon the inner end thereof that lies against the inner face of said lug. The relative movement of the uprights 2 and 3 toward and away from each other, is determined by the position of these Specification of Letters Patent.

Application filed April 7, 1913.

flush with the top 12 thereof, as

Patented Apr. 21, 1914. Serial No. 759,487.

adjusting screws upset the end of this screw or strip the thread thereon to such an extent as to make it impossible to withdraw it through the nut 8. In such cases it is necessary t0 1nsert a new screw, and this is done by taking down the entire mechanism in order to remove the upright from the base and cut off the inner end of the screw so as to withdraw it through the nut. It is thus apparent, that to replace one of these adjust- 111g screws, is a work of some magnitude. To overcome the above, and other objections to the present general practice of mounting these adjusting screws, I have so designed the several parts that the screw and nut may be inserted or removed without disturbing the uprights or any of the mechanism connected therewith. Hence, to take out an old screw and substitute a new one requires but a few moments time and practically no labor. To accomplish this result, I provide the lug 10, upon the base member, with a recess 11 in its upper surface of substantially the same width as the diameter of the screw and of such depth that the upper surface of the screw will be substantially shown in Fig. 3, and further to provide a pocket 13 in the outside of the upright near the bottom edge of sufficient size to permit the hand to be placed therein above the top of the lug 10, and pass down back of the inner end of the lug 10. The object of these features, just described, is to provide means whereby the inner end of the screw may be grasped by the hand and lifted out of the lug if necessary. When in place, as shown in Fig. 1, the screw is prevented from accidental dislodgment by means of a keeper key 15, which rests upon the top of the lug 10, with its upper surface against the underside of the retaining lips 14c upon opposite sides of the pocket 13, in which position the recess 16, in the end of the keeper key, projects over the nut 8, as shown in Fig. 1. Endwise movement of the keeper key is prevented by the clamp 17, which is secured by the screw 18 to the base 1, with the lip 19 thereon against the end of the keeper key. The clamp 17 is split at 20, and through the bolt 21, its frictional hold upon the screw 7, threaded therethrough, is made-variable.

Having described my invention, claim as new, and desire to secure by Letters Patent, is 7 1. In a drop hammer, the combination with a plurality of uprights; of a base, having screw receiving recesses therein, corresponding in number with said uprights; a screw within each of said recesses, a nut upon each of said screws; and means for closing the open sides of said recesses, to prevent the accidental removal of the said screws therefrom.

2. In a drop hammer, the combination with a base, having recesses therein; of a plurality of uprights, each having a pocket in the outer edge near the bottom thereof: an adjusting screw within each of said recesses; a keeper key within each of said pockets and closing the said recesses; and means for preventing the endwise movement of said keeper key.

3. In a drop hammer, the combination with a plurality of uprights, each having a pocket in the outer edge near the bottom thereof, with retaining lips thereon; of a base having a plurality of lugs thereon, corresponding in number with said uprights, each of said lugs having a recess in the top thereof; a screw within each of said recesses; a keeper key within each of the said pockets and lying between the said lug and retaining lips; and a retaining member, having contact with said keeper key to prevent the endwise movement thereof.

a. In a drop hammer, the combination with a base, having recesses therein; an

what I having a pocket in bottom thereof that is opposite one of adjusting screw within each of said recesses; a plurality of uprights upon said base, each the outer edge near the said recesses and of such size as to permit the entrance of the said adjusting screw outside of the said recess; and a keeper key within each of said pockets and closing the said recesses when said adjusting screw is in its corresponding recess.

5. In a drop hammer, the combination with a plurality of uprights; of a base, having screw receiving recesses therein corresponding in number with said uprights; a screw within each of said recesses; a nut upon each of said screws; and means for closing the open sides of said recesses to prevent the accidental removal of the said screws therefrom, said means having contact at one end with said nut.

6. In a drop hammer, the combination with a plurality of uprights; of a base, having screw receiving recesses therein corresponding in number with said uprights; a screw within each of said recesses; a nut upon each of said screws; and means for closing the open sides of said recesses to prevent the accidental removal of the said screws therefrom, said means having contact with one side and one face of said nut.

In testimony whereof I afi ix my signature in presence of two witnesses.

CLARENDON NICKERSON.

Witnesses J. M. GALLoNn, GEORGE E. HALL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

